Rock-drill mounting.



E. M. MAOKIE & P. F. DOYLE.

" ROCK DRILL MOUNTING.

APPLICATION IILED AUG. 10, 1908.

1,007,21 6, r Patented Oct. 31, 1911.

a SHEETS-SHEET 1.

E. M. MACKIE & 'P. P. DOYLE.

ROCK DRILL MOUNTING.

APPLICATION FILED AUG. 10, 1908.

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1,007,216. Patented Oct. 31,1911.

' a SHEETSSHEBT 2.

55074 inw- MW- E. M. MAGKIYE & P. P. DOYLE.

ROCK DRILL MOUNTING. APPLIOATION FILED AUG. 10, 190B.

Patented Oct. 31, 1911.

3 SHEETS-SHEET 3.

v x QN J UNITED STATE PATENT OFFICE.

EDWIN M. MACKIE AND PERGIVAL F. DOYLE, 0F FRANKLIN, PENNSYLVANIA,ASSIGN- ORS TO CHICAGO PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, ACORPORA- TION OF NEW JERSEY.

ROCK-DRILL MOUNTING.

Specification of Letters Patent.

Patented Oct. 31, 1911.

To all whom it may concern:

Be it known that we, EDWIN M. MAGKIE, a citizen of the United States,and PEROIVAL F. DOYLE, a citizen of the Dominion of Canada, bothresiding at Franklin, in the county of Venango and State ofPennsylvania, have invented certain new and useful Improvements inRock-Drill Mountings, of which the following is a specification.

Our invention has relation to the so-called mountings for rock drillsand the general object thereof is to provide simple, durable, efficientand time-saving methods of mounting such drills and of securely holdingthe same under the severe jars and strains to which machines of thisclass are subjected. To this end, according to our invention, weeliminate, as fastening elements, all bolts and nuts, which, as is wellknown to those acquainted with the practical art, are troublesome andunsatisfactory in machines of this character, owing to the fact thatunder the severe conditions of the work the threads on the bolts and inthe nuts become corroded, besides which the threads become bruised andmutilated, making the process of unscrewing and tightening the nuts atedious and time-consuming ob. For such fastenings, we provide a seriesof clamps of special construction and design, making the partsinterchangeable as far as possible for the different places of use,thereby reducing the number of different parts required.

' Our invention is applicable to any type or character of moimting usedin the practical operation of rock drills, such as rock drill columnsand tripods as well as the rock drill shell-carriage or other supportingmember.

The various features of advantage and utility presented by our inventionwill be apparent from the description hereinafter given.

In the drawings, Figure 1 is an elevation, partly in section, showingour invention applied to several clamps of a rock drill col umn, and thecolumn arm; Fig. 2 a sectional elevation on line 2-2,of Fig. l but withthe step clamp and one of the other clamps in separate section; Fig. 3 asection on line 33 of Fig. 1; Fig. 4: a sectional plan taken on'line 44of Fig. 1 but on an enlarged scale; Fig. 5 an end view of the partsshown in Fig. 4 with a portion broken away; Fig. 6 an elevation of amodified form of keying bar; Fig. 7 a plan view of the mounting for arock-drill shell-carriage with our invention incorporated therewith;Fig. 8 a

side elevation thereof with a portion broken away; and F ig. 9 a sectionon line 99 of Fig. 7.

Referring to the present embodiment of our invention as applied to theshaft column of a rock drill and the column arm, as well as to thesafety clamp of such column, as shown in Figs. 1 to 5, the column orstoping bar 1 is provided with the column arm 2, and the clamp 3 forhammer rock drills. In the present instance, the mountings are .stillfurther provided with a swivel clamp 4 which together with the pipe orfixture 5 is adapted to clamp the feed barrel of an air feed rock drill.The safety clamp is indicated at 6, the foot or step clamp at 7 at thebottom or jackscrew end of the column or stoping bar, the column armclamp for the shell or carriage foot of a reciprocating rock drill at 8.

Describing first the column and column arm clamps, and the safety clampin which our invention is embodied, each of these clamps is providedwith a keying block 9 having its inner face of a curvature adapted tofit the column or column arm (as the case may be) against which the sameis designed to be forced or clamped. Each keying block is provided withan outwardprojecting or radial extension 9" having a transverse openingor pocket 9". Such extension is received by a socket 3 formed on each ofsaid clamps, whereby the blocks are kept in their respective places whenthe clamping devices are unkeyed and separated from the member to whichthey belong. In order to force the keying blocks against their membersto which they are clamped, each of them is provided with a key 10 whichpasses through said opening 9 and corresponding openings in saidextensions 3 and which has one inclined edge presented against its blockto force the latter against the column or column arm as the case may be.To retain these keys pins 11 or the like may be provided. By preference,each clamp proper is provided with two bearing pads indicated at 00 inFigs. l and 5, so that when the blocks are keyed in position, each clamphas three bearing surfaces, composed of said two pads and their block.We thus avoid the necessity of machining the interior surface of theclamp which is otherwise required. The clamps are very simple inconstruction and most eflicient for machines, like rock drills,subjected to severe usage and great strains and jars. Moreover, theclamps may be easily and conveniently loosened or tightened by simplydriving the key in the proper direction. This case of manipulation isregardless of the period of time between operations or the action of theelements and is also regardless of the usage and bruising of themachine, to all of which conditions the bolts and nuts of the ordinaryclamps are comparatively sensitive.

The foregoing description applies to three of the clamps shown, to-wit,the column clamp by which the column arm is clamped to the column, thecolumn arm clamp by which a hammer rock drill is clamped to said arm,and a safety clamp clamped at any desired height on the column tosustain the weight of the swinging column arm when loose and allow it tobe safely swung into any desired posit-ion. The corresponding parts areconsequently provided with similar reference characters.

For the clamp for the air feed cylinder we provide a somewhat differentconstruction, according to which the clamp proper consists essentiallyof a split ring 4: and a keying bar 12. The ring is provided withradially extending lugs 4% located at the line of split and having anend transverse slot at at to receive the keying bar 12. The bar is heldin place by a pin 13 passing therethrough and longitudinally through oneof the lugs 1 and to retain the pin in position in case it should becomeloose cotter pins 14 may be provided therein as shown. In the clampingoperation, a key 10 is passed through a transverse slot 12 in the keyingbar and driven inwardly, one side of the pin bearing against the outerface of one of the lugs 4 In this form of clamp, it is the intention topinch the feed cylinder with the interior surface of the clamping pipeor tube so as not to distort the feed barrel which would causerestriction to any part moving in the interior of the same, suchasapiston. Consequently, this clamp has no pads like the other clamps.Modifications may be made in the construction, as, for instance the pins13 may be dispensed with, in which case the bar 12 would be providedwith a head 12 as shown in the modification illustrated in Fig. 6.

The step clamp or jack screw foot piece 7 is of substantially the sameconstruction of fastening as described in connection with the feedbarrel clamp 4. In this step clamp, the clamp proper is of the splittype and has lugs 7 at the line of split. A keying bar 15 passes throughsaid lugs and is kept in place by a pin 16, supplemented, if desired, bya dowel 17 to keep pin 16 in proper location in the keying bar 15 incase it should get loose. If desired, this keying bar might also be madewith a solid head like the modified form of bar shown in Fig. 6. The key10 acts the same in respect to the step clamp as described in connectionwith the clamp for the air feed drill.

For clamping the shell-carriage of a reciprocating drill to the columnarm, the clamp 8 is constructed as to its lower part in the same manneras the column clamp hereinbefore described and the same is intended toclamp a column or column arm in the same manner. The parts being thesame, they are given similar reference characters. However, the upperpart of the clamp is provided with a keying bar 18, a key 10 therein, akey bar pin 19, dowel 20 and a keying block or jaw 21 which engages thefoot 22 of the shell of the drill cylinder. As shown at 2 in Fig. 7 weprefer to relieve the central portion of the clamp and clamping bar 10to provide a more secure fastening and also to eliminate breakages ofshell foot 22 caused, as frequently happens, by the foot being of asmaller radius than the clamp and thus localizing the gripping strainand bending and breaking such foot. Like the other bars, the bar 18 maybe made with a solid head, thereby eliminating pin 19 and dowel 20.

The corresponding parts of the various clamps described are made of astandard size and interchangeable with all the attendant advantages.

We claim:

1. A clamp for rock drill mountings comprising a clamp proper encirclinga part of such mountings, a keying block arranged therein andinterlocked therewith to retain it when the device is unkeyed, and a.key passing through the block and adapted to force the same against saidpart, substan tially as described.

2. A clamp for rock drill mountings comprising a clamp proper encirclinga part thereof and having a side opening, a keying block having aportion adapted to contact said part and an outwardly projecting portionadapted to fit in said opening and provided with a keyway, and a keyadapted to fit into said keyway and to thereby cooperate with said blockto force it against said part, substantially as described.

3. A clamp for rock drill. mountings comprising a clamp properencircling a part thereof and having a side opening, a keying blockhaving a portion adapted to contact said part and an extension fittingin said opening and provided with a transverse slot, and a key passingthrough said slot and adapted to force the block against said part,substantially as described.

4:. A clamp for rock drill mountings comprising a clamp properencircling a part thereof and having a side extension provided with anopening, a keying block having a portion adapted to contact said partand also an extension fitting in said opening and provided with atransverse slot, said clamp extension being provided with correspondingslots and a key passing through said slots and adapted to force theblock into engagement with said part, substantially as described.

5. A clamp for rock drill mountings comprising a clamp proper encirclinga part thereof and having a side extension provided with an opening, akeying block having a portion adapted to contact said part and also anextension fitting in said opening and provided with a transverse slot,said clamp extension being provided with corresponding slots, and a keypassing through said slots and adapted to force the block intoengagement with said part, said key being inclined on one edge,substantially as described.

6. A clamp for rock drill mountings comprising a clamp proper encirclinga part of such mountings and having engaging pads m, a keying blockhaving a portion also adapted to engage said part and provided with atransverse opening, said clamp also having an extension provided withright angled openings, one for said keying block and the other for thekey, and a key passing through said clamp and also the keying block,substantially as described.

EDWIN M. MAGKIE. PERCIVAL F. DOYLE.

lVitnesses:

A. E. STRAN, ROBERT N. SPEER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

